100 Sheets Of Filter Paper, Grade 1, Qualitative, 185 Mm. Filter Paper, Qualitative, Grade 1, 185 mm Pack of 100 sheets. Supertek Qualitative filter papers are made from virgin cellulose fiber. Grade 1 filter papers are suitable for medium flow rate and medium retention applications. Grade 1 filter papers are the most widely used in general laboratory use. They are frequently used to purify or clarify liquids. They are frequently used to separate precipitates or sediment from liquid for further analysis. Supertek Grade 1 Filter Paper will retain particles down to 9 nanometers in size. Very useful in waste water treatment, soil analysis or seed testing, education and in the commercial food industry, Product Features Virgin Cellulose Fiber 9 Nanometers Retention Filtration Qualitative Filter Paper Medium Flow and Retention Rates Shipping: Shipping is complimentary within the lower 48 US States. We Do Not Ship to PO/APO Boxes, HI or Alaska We Do Not Ship Outside of the Continental US All items ship within 24-72 hours of Payment For large items that require Freight shipping a valid phone number is required to call and schedule your delivery Terms of Sale and Feedback: Feedback is extremely important to us and If you are satisfied with our transaction, please take a moment to leave Positive Feedback. YOUR Satisfaction is our #1 Priority! If there are any issues, PLEASE contact us BEFORE leaving a neutral or negative rating so that we may resolve any concerns. We PROMISE we can make you happy if you give us a fair chance. Returns / Concerns: All items qualify for returns within 14 - 30 days of receipt. Buyer is responsible for return shipping on any item that is not damaged Please be sure this is an item you want before making your purchase. Customer Satisfaction is our TOP priority! All items are IN STOCK at time of listing. Inventory changes constantly and it is impossible to maintain a perfectly accurate count of all items. Please do not penalize us if we have to issue you a refund! Thank You For Your Business!